diff --git a/pom.xml b/pom.xml
index d444ba772..75a82f347 100644
--- a/pom.xml
+++ b/pom.xml
@@ -88,7 +88,7 @@
     <rngom.version>201605</rngom.version>
 
     <dtd-parser.version>1.5.1</dtd-parser.version>
-    <istack.version>4.0.1</istack.version>
+    <istack.version>4.2.0</istack.version>
     <activation.version>1.2.0</activation.version>
     <jaxb2-basics.version>0.12.0</jaxb2-basics.version>
     <slf4j.version>1.7.36</slf4j.version>